The top tips for scaling FDM 3D models include keeping dimensions proportional, checking wall thickness, adjusting infill, and testing prototypes.
Proportional scaling avoids structural imbalances, while ensuring wall thickness (at least 2–3 times the nozzle diameter) keeps parts strong. Adjust infill—lower for larger models to save material, higher for smaller ones to add durability. Testing small scaled prototypes catches issues like warping or layer separation early.
If scaling by over ±50%, start with a 10–20% test print to refine settings without wasting filament.